Yamaha NHB32-C Service Manual page 37

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4.2 Testing
Select "2. NHB32-C MAIN SHEET" on the start-up screen of the TEST PROGRAM, and testing of test items is automatically
executed in the order of the following test items.
1 FLA : READ/WRITE test of FLASH ROM
2 RAM : READ/WRITE test of DRAM
3 EEP : READ/WRITE test of EEPROM
4 DSP : READ/WRITE test of DSP5 register
5 CM1 : READ/WRITE test of CM-1 HM1
6 COB : Serial LOOP BACK test of CM-1
7 USB : USB test
8 DIO : AES/EBU test
9 COM : COM LOOP BACK test
10 MID : MIDI LOOP BACK test
11 WCK : Word clock test
12 ROT : UNIT ID select SW test
Turn the SW201 switch of the MAIN circuit board clockwise according to the instruction on the PC screen.
Testing of following test items is executed one by one when the "ENTER" key of the keyboard is pressed.
13 SWI : SWITCH input test
Press the switches of the PN-LED circuit board in the order of SW201 → SW202 → SW203 → SW204 according
to the instruction on the screen.
14 LED : LED lighting test
1. Check that LED's on the PN-LED sheet light up in the following order.
TE
LD216 → LD224 → LD201 → LD202 → LD203 → LD214 → LD204 → LD205 → LD206 → LD217 → LD215 →
L 13942296513
LD218 → LD223 → LD213 → LD212 → LD211 → LD220 → LD209 → LD208 → LD207 → LD226 → LD221
2. Check that LD210 (7 seg. LED's) of the PN-LED circuit board light one by one in the order of "0, 1, 2, 3, 4, 5, 6, 7, 8, 9, .".
3. Check that all LED's light up at the end.
5. Testing of AES circuit board
5.1 Connection
Using the USB cable, connect CN308 of the MAIN circuit board and the USB terminal of PC.
Using the serial cable (cross), connect CN504 of the AES-AES 1 circuit board and the serial terminal of PC.
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Set SW201 of the MAIN circuit board to "0".
Connect the BNC cable to JK306 of the PN-JACK circuit board. (WORD CLOCK IN-OUT)
.
Connect the MIDI cable to JK303 of the PN-JACK circuit board. (MIDI IN-OUT)
Connect the "reflected jig B" to CN301, CN401 of the AES-AES1 circuit board and CN701, CN801 of the AES-AES2 circuit
board. (AES/EBU [1~4])
Connect the "reflected jig A" to CN901 of the AES-AES2 circuit board. (COM)
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B B
A : Reflected jig A
B : Reflected jig B
CN701 CN801 CN901
ABS - ABS2
sheet to be tested
(V9051000)
CN604 CN603 CN605
RS-232C cable
(cross)
Windows
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Automatic judgment
Automatic judgment
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Q Q
3 6 7 1 3
A B B
JK306
PN-JACK (V9050300)
CN301
CN301 CN401 CN504
ABS - ABS1
sheet to be tested
(V9050900)
CM-1 (V9811200)
CN201 CN202 CN203
CN501 CN502 CN503
CN601 CN305 CN602
CN403 CN402
CN303
CN308
MAIN (V9061800)
USB cable
CN201
PN-LED (V9050200)
PC
.
9 4 2 8
1 5 0 5 8 2 9 9 4
JK303
POWER
SUPPLY
(V9702900)
CN51
m
co
NHB32-C
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2 8 9 9
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